docs: def gather_lines(self):
          """
          Return the number of lines.
          """
          total_lines = 0
          for file in self.all_files:
              full_path = os.path.join(self.paths["role"], file)
  
              with open(full_path, "r") as f:
                  for line in f:
                      total_lines += 1
  
              if full_path.endswith(".yml"):
                  self.yaml_files.append(full_path)
  
          return total_lines